[Bug 1769433] [NEW] do-release-upgrade from 32-bit 16.04 to 18.04 goes ahead, doesn't work and messes everything up

[Launchpad Bug Tracker]

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I decided to test Ubuntu 18.04 on an old computer with 16.04 32-bit
without knowing that only 64-bit was supported. do-release-upgrade
seemed to perform all the actions without any problem. But, logically,
the newly installed OS didn’t work.

After a quick research, I realised that the problem was the 32-/64-bit
part and reinstalled the 16.04 32-bit version. I was forced to format
the main partition as far as the 32-bit installer didn't recognise the
64-bit installation as a valid OS.

After finishing the 16.04 32-bit installation, performing the
recommended updates and installing just a few programs (very stable and
which I have always used on that computer), the OS started behaving
weirdly. At first sight, it was working fine, but kept getting regularly
frozen and not starting properly. Finally, I seemed to have fixed all
the problems by forcing (because it wasn't immediately available either)
dist-upgrade.

Long story short: my computer has been behaving erratically for 2 days
without never getting a clear indication about what might be wrong. Even
worse, all this has been provoked because the OS  allowed me to perform
an impossible action. The fix seems also quite straightforward: avoid
any 32-bit version to be upgraded unless that format is available.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 18.04 32-bit bot-comment do-release-upgrade
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do-release-upgrade from 32-bit 16.04 to 18.04 goes ahead, doesn't work and messes everything up
https://bugs.launchpad.net/bugs/1769433
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